contour line labels in trellis contourplot

Hello,
In the classical function "contour" labels are drawn so that each contour line is broken at the place of the label,
  so that the label does not overlap the line. In the trellis contourplot the labels are placed beside or over the line,
  controlled by the label.style parameter, but I could not find
an option that would place the labels just as in the classical contour: breaking the contour line to make place for
  the label.

Have You got any ideas how breaking the contours to make place for the labels could be achieved in a trellis contourplot?

Best regards,

Martin

Dr. Martin Ivanov
Eberhard-Karls-Universit?t T?bingen
Mathematisch-Naturwissenschaftliche Fakult?t
Fachbereich Geowissenschaften
Water & Earth System Science (WESS)
Keplerstra?e 17, 72074 T?bingen, Deutschland
Tel. +4970712975023